Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Introduction to Wind, Dust and Desert

Skip navigational links
Loading
Dictionaries: Our Mapping Systems   The USGS and Science Education   USGS Fact Sheets   Topics   Keywords   Data Dictionary   Metadata Dictionary   Computer Terminology   Digital Formats  
InfoBank Terms: Activity ID   activity overview   crew   digital data   formal metadata   lines   metadata   NGDC   port stops   project/theme   region   ship   stations   time   virtual globe   year  
Data Types: bathymetry   biological   geochemical   gravity   ground penetrating radar   imaging   LIDAR   logs   magnetics   metering equipment   navigation   samples   seismic   total station   definitions disclaimer  
Data Formats: ARC coverage   E00   FGDC metadata   gridded/image   imaging   material   scattered/swath   Shapefile   vector/polygon  
Comment: 00:40 - 01:54 (01:14)
Source: Annenberg/CPB Resources - Earth Revealed - 22. Wind, Dust and Deserts
Keywords: introduction, "James Sadd", "Death Valley", lake, valley, shoreline, grassland, slope, "pine tree", humid, animal, bison, antelope, horse, pelican, flamingo, climate, glacier, "Ice Age", salt, lakebed, desert, plant, evaporation

Our transcription: Death Valley hasn't always looked like this.
Within the last 100,000 years, a lake 600 feet deep covered this valley floor.
The surrounding shoreline was grassland, and these hill slopes were covered with pine trees.
The mild, relatively humid climate was enjoyed by such diverse animals as bison, antelope, horses, pelicans, and flamingos.
But all this changed about 11,000 years ago, when the Earth's climate began to warm, and the glaciers of the last Ice Age melted back in retreat.
Today the lake is gone, it's been replaced by this salt encrusted dry lakebed.
When the lake disappeared; so did the grasses, and the forest retreated up the mountain slope.
A very different community of plants and animals now inhabit this region.
In short, all of the characteristics of a typical desert.
But Death Valley is not alone, you see this same dramatic change in environment in deserts all over the world.
And this change is the direct result of geologic processes that operate on a global scale.

Geology School Keywords
Skip footer navigational links

Coastal and Marine Science Centers:  Pacific   St. Petersburg   Woods Hole  
InfoBank   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer  


Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/20.01.01.html
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:27:36 PDT 2013  (chd)